Automobile-wheel rim.



UNITED STATES PATENT OFFICE.

ZACHBIAH TAYLOR CLARK, 0F PDR'ILAN'D, OREGON.

COMPOSITION FOR HARDENING STEEL AND SIMILAR METALS.

No Drawing.

To all whom it may (romcrn:

Be it known that-,1, Zaounmu TAYLOR (71mm. a citizen of the United States, and a resident of Portland, in the county of 1\Iultnon1ah and State of Oregon. have invented a new and linproved Composition for I-Iardeniing Steeland Similar Metals, of which the following. is a full, clear, and exact description.

My intention relates to a composition in liquid form for tempering and tougrlugning steel, iron, and similar metals. The. nnixlure utilized for the hardening results from the intcrmixing of the following ingredients in substantially the following proportions: Linseed oil, 4.755 gallons; copper sulfate, six ounces; common salt, five pounds; 1mslaked lime, two pounds; zinc, two ounces; oxid of iron, four ounces. The solid ingredients are thoroughly mixed Specification of Letters Patent,

Application filed January 17, 1917.

Patented Jan. 15, 1918;

Serial No, 142,904.

The metal to be tempe'ed is heated. to

the desired temperature and then immersed, while in the hot state, in the solution for a few seconds, the mixture acting almost in-.

stantaneously on the metal in such a manner as to temps and toughen Without checking or warping the metal, thereby affording a uniform temper of the desired degree without trouble or mistake of the operator.

I claim:

A composition for tempering steel and similar metals, which results from the mixing of the following ingredients,-copper sulfate, connnon salt, unslaked lime, zinc, oxid of iron, in proportions substantially as specified, added to linseed oil, also in proportions as specified.

ZACIIRIAH TAYLOR CLARK: 

